Gas-mixer.



J. NEEDHAM.

GAS MIXER.

APPLICATION FILED APR. 17. 1915.

Patented July 25, 1916.

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JOSEPH NEEDHAM, 03E PASSAIC, NEW J'Elt/SY.

GAS-MIXER.

Specicaton of Letters Patent.

Patented July 25, illil.

Application led April 117, 1915. Serial No. 21,952.

To all whom t may concern: Y

Be it known that l, JOSEPH NEEDHAM, a subject ofthe King of Great Britain, and resident of Passaic, in the county of Passaic and State of New Jersey, have invented certain new and useful Improvements in Gras` Mixers, of which the following is a specification.

My invention relates to gas burners of the well known Bunsen type, in which gaseous fuel is admixed with air in order to obtain the most eiiicient combustion of the same.

In particular my invention relates to the means, which area part of such burners and vwhich regulate and control the admission and admixture of the proper quantities of gas and air and it has for its object to provide. a mixing device, wherein the area of the openings or ports admittingboth the said gas and air can be simultaneously adjusted and controlled by the movement of only one movable part of my device.l For this purpose l provide my gas mixing device with stationary main ports 'for the admission of the gas and of the air and the chamber, wherein the said gas and air are mixed, l provide with auxiliary air and gas ports and make the said chamber movable with respect to the said stationary gas and air ports. The said auxiliary gas and air ports cooperate with the said stationary gas and air ports in such a manner, that when the said movable mixing chamber is moved, the auxiliary gas and air ports provided thereon simultaneously regulate the e'ectivev openings of the said stationary ports as will be hereinafter more fully described. l am thus enabled to attain the simultaneous regulation of both the air and gas ports in a very simple manner directly within the interior of the mixer casing and without the interposition of auxiliary means on the exterior thereof, such as sleeves and shutters,

operated by levers and other mechanicalv devices which have been used heretofore.

. Another object of my invention is to provide a gas mixer of simple and compact design, which is composed of a minimum number of parts and Whlch lends itself to easy and economical production on a large scale, and the movable part of which .has a definite and absolutely controllable movement, is not liable to get out of order and issubject to practically no wear.'

A still further object of my invention is to provide a gas mixer, wherein the mixture is prevented from becoming disproportion- V ate. For this purpose l construct my mixer A still further object of my invention isV to provide means whereby the movable mixing chamber may be locked in a desired position, so that the volumes of gas and air admitted by the gas and air ports in that position may remain unchanged and to provide such locking devices with indicating means whereby the amount of gas consumed may be ascertained f A still further object of my invention is to provide a gas mixer which lends itself to easy manipulation by thermostatic and other devices in cases where control of temperatures or gas volumes is required. As my mixer has only one movable part, the movement of which simultaneously controls both the air and gas ports, it is easily possible to vary the total volumes of gas and air admitted without varying the relative proportion ofthe said gas and air, so that such control vcan be obtained in almuch simpler manner than with the combination of levers, pins,

and valves hitherto used for this purpose.

My invention is illustrated in the accompanying drawing.

Figure l of the said drawing represents a longitudinal cross-section of my gas mixer, showing the movable mixing chamber in its lowermost position, both stationary air and ,gas ports being closed. Fig. 2 shows the same cross-section as Fig. l, but the movable mixing chamber is in its most advanced position, both the stationary air and gas ports being fully open. Fig. 3 shows a cross-section of the construction shown in Figs. l and 2, online 3-3 of Fig. 2. Fig. 4 shows a tary instead of longitudinal. Fig. 6 is aside view of this construction, Fig. 7 is a cross-section 4thereof and Fig. 8 is an end view ofthe same looking in the direction of the arrow in Fig. 6.

It is understood that I do not limit myself to the precise constructions and arrangements of parts shown in the drawing, as it is evident that various modifications and changes of form may be made therein without departing from the spirit of my invention.

The construction shown in Figs. 1 and 2 comprises a casing consisting of a tubular metallic barrel 1, the said barrel being'near the lower extremity thereof provided with two oppositely disposed transverse slots 2, 2, extending'almost around thev entire circumference thereof. The said slots 2, 2, serve as stationary portsfor the admissionof air into the interior of my mixer. The lower extremity of the said barrel 1, is closed by a threaded plug 3, comprising a tubular rear portion 4, a knurled flange 5, a threaded portion 6, and aY central projecting piece 7 integral therewith. The said projection 7 is cylindrical for 4a certain distance and then provided with a shoulder 8, at an angle ofv substantially 450, the forward extremity of the said piece 8, then being gradually tapered down into the shape of a sharp pointed conical needle valve 9. The threaded plug 3, is provided with a central longitudinal aperture 10, which communicates with three small apertures 11, located Within the said shoulder 8. The said apertures 11, serve as stationary ports for the admission of gas to the interior of my mixer, the said tubular rear portion 4, of the plug 3, being adapted to be connected to a gas supply pipe (not shown) and provided for this purpose with an interior thread 12. Adapted to be moved longitudinally of the said barrel 1 is a cylindrical tubular mixingchamber 13, which comprises a tubular rear portion 14, slidingly fitting within the barrel 1, a sloping shoulder portion 15 and a tubular forward Aportion 16 of somewhat smaller diameter than the said portion 14. The rear extremity of the tubular portion 14, is closed by a plug 17 provided with a central hollow projection 18. integral therewith, adapted to slidingly fit over the aforesaid projection 7. The end of the said projection 18,

is conical and provided with a central aperauxiliary air ports.

mamas@ ture 19. 'I he said aperture 19, serves as auxiliary gas port. Near its rear extremity the said portion 14, of the movable mixing chamber 13, is provided with two oppositely arranged transverse slots 20, 20, serving as The said slots 20, are adapted to. register with the said stationary slots 2, 2, provided in the casing 1.

The operation of my device is as follows: As shown in Fig. 1, where the movable mixing chamber 13, is in its lowermost position, the admission of gas to the interior of my mixer is prevented, because'y the conical needle valve 9, has entered into the aperture 19, and hasclosed it. The admission` of air is also prevented, because the slots 20, 20, are below the level of the slots 2, 2, shown in dotted lines in Fig. 1, and are therefore covered by the wall 'of the casing 1 while the slots 2, 2, are covered by the wall of the portion 14, of the movable mixing chamber 13. 0n the other hand, as shown in Fig. 2, where the movable mixing chamber 13, has moved longitudinally forward with respect to the casing 1, and is in its most advanced position, the aperture 19 is fully open so that the -maximum amount of gas can enter and the movable slots 20, 20, register with and have fully uncovered the stav tionary' air ports 2, 2. It is thus evident that for any intermediate point between the two `extreme positions of the movable mixing chamber 13, the position of the said chamberdirectly controls the effective openings of both the air and gas admitting orifices and that the movement thereof regulates simultaneously both the supply of air and of gas to the interior of my mixer. It will also be, seen that the distance of the air ports 20, from the gas port 19, remains always the same and that also the distance between the said ports 20 and 19 and the` forward extremity of the forward portion 16 of my movable mixing chamber, whencel the mixed gases issue therefrom, remains always the same, so that the mixture cannot .become disproportionate.

In order to lock the movable mixing chamber. 13, lin a desired position, I provide the barrel 1, with alongitudinally extending slot 21, registering with a threaded hole 23, provided in the wall of the movable mixing chamber 13. Aset screw 22, enters into the said threaded hole from the exterior of said barrel 1, and is adapted, when screwed tight, to hold the said movable mixing c amber 13,

inany desired position for the a mission of a" predetermined quantity of gasand air.

The forward extremity of the casing 1 is provided with an exterior thread 24, for the purpose of connecting my gas mixer with a burner head (not shown) of Aany desired configuration.

In the construction shown in Figs. 3 and 4 the longitudinal movement of my movable .'nixing chamber is accomplished by different mechanical means. The device -illustrated therein comprises a barrel-shaped tubular casing 25, which is closed by a solid part 2,6, at its rear extremity. For a certain distance the metal at the rear extremity of the said forward extremity and this portion'may be provided with an interior screwthread 30,

for the purpose of connecting` it with a pipe (not shown) leading to a burner head.

Thesolid rear portion '26, of the casing 425, is provided with a central threaded aperture 31, adapted to receive therein the threaded tubular nipple 32. The said tubular nipple 32 comprises a threaded rear portion 33, a shoulder portion 34, abutting against the said casing 25, and a forward portion 35, provided with a fine thread on its exterior. The threaded rear portion 33, is adapted to be connected to a gas delivery pipe (not shown) and is provided for this purpose on its exterior with the usual coarse gas pipe thread. The forward end of the said tubular nipple 32 is closed, but-provided with a series of holes 36, 36, serving for the admission of gas into the interior of the device, and a central cone shaped extension piecev 37, terminating in' a sharp point, the said yholes 36, 36, being located around the base of the said cone. The said cone 37, serves the purpose of a needle valve.

'ithin the said barrel 25 there is movably arranged a tubular mixing chamber 38, of

such an exterior diameter as to fit slidingly is'slightly reduced and the surface thus obtained is provided with riflled teeth 46, cooperating with a spring 47, for the purpose of retaining the movable mixingr chamber 38, in a desired position. As the rillled teeth surface 46, is gripped with the fingers and revolved, the whole mixing chamber travels longitudinally forward or backward with respect to the casing 25, according to the direction of the rotation, -upon the exterior threaded surface of the portion 35, of the nippleV 32.

r1`he portion' 40, of the movable mixing chamber 38, is provided with three transverse slots 48, serving asmovable air ports and adapted to register with and uncover the said stationary slots 29, 29, in the casing 25,'to the desired degree, according to the position of the movable mixing chamber Within the casing 25. v

1n Figs. 4 and 5, the movable mixing chamber is shown in intermediate position, the stationary air ports 29, 29, being partly covered and the effective opening of the stationary gas ports 36, 36, being reduced by the conical needle valve 37, entering partially into the aperture 44.

In the construction shown in Figs. '6, 7 and 8 my movable mixing chamber has a rotary movement with respect to the stationary air ports, the same movement regulating the effective opening of the gas port. The said figures show my device in a position where the stationary air ports and the gas port are half open.

One of the stationary parts of my gas mixer is constituted by a double-cone shaped piece of metal, of which the conical part 49, is continuous whereas the other conical part 50 has cut into it. four longitudinal slotsl, disposed equal distances apart around the circumference thereof. The said slots 51 serve as stationary air ports. `A guiding iiange 52 is disposed around the circumference of the double cone at the point of the maximum diameter thereof, for the purpose of guiding therein one extremity 'of the movable part of my device, as will be hereinafter more fully described. The extremity of the said conical part 49, is provided with a flange 64, having an interior thread 65, for the purpose of connecting it with a burner head (not shown) of: any desired shape. The other stationary part of my mixer is constituted by a short tube 53, the outer extremity of which is provided with a thread54, adaptedto be connected to a gas delivery pipe (not shown). The other extremitypf the said pipe 5I, is provided with an integralouter fiange 55 and an integral inner iiange 56. The said outer fiange serves as a guide for the other extremity of the movable part of my mixer. The inner flange 5G serves as a stationary support for three crescent-shaped movable blades 57 of an iris shutter of the usual construction, the said blades being supported snugly and slidingly over the said slotted part 50. The la'rger extremityT of the said conical piece 59 is provided with a bearing rim-60, for the purpose of guiding the said movable part 59ivvithin the aforementioned flange 52. The smaller extremity of the saidmovable part'59 is bent into the shape of trough-shaped guiding flange 61, adapted to overlap the outer lia-nge 55 of the pipe 53, and to be guided thereon'. The said trough-like iange 61, serves also as a support for the movable pins 62, Which actuate the opening and the closing of the shutterrblades 57 in the usual manner. Cut Within the said piece 59, there are four openings 63, equally spaced apart, serving the purpose of movable air ports and adapted to register with the said stationary air ports 51. The said shutter bladesy 57 are adapted to open or close according to the movement of the said movable piece 59 and in the position shown in Figs. 6, 7 and 8- they leave an opening 66 through which the gas can enter into the interior of my device.` It will be seen that as the conical movable part 59 has a rotary movement im- ',parted to it, it will gradually uncover the openings 51 in the stationary part 50 and at the same time Will gradually cause the iris shutters to open until the stationary air portsv 51 are uncovered to the maximum degree and the shutter blades 57 are fully open. .Y

In order to lock the device described, in a desired position, for a predetermined opening of the gas and air admission orifices, the movable part 59 is provided With a slot 67 registering with a threaded hole in the stationary conical part 50, a set screw 68 entering into the said hole being adapted, when screwed tight, to lock the said tWo parts together.y i

- Having thus described my invention I claim:

l.v A device of the character described comprising ast-ationary tubular casing having an air port therein, a stationary gas port Within the said casing, land a mixing chamber within the said casing movably disposed With respect to the same, the said mixing chamber being provided with auxiliary air and gas ports coperating respectively With the iirst mentioned air and gas ports and adapted to simultaneously increase or decrease the effective openings of the said first mentioned air and gas ports according to the direction of the movement of the said movable mixing chamber with respect toy the the said stationary tubular casing. i l

2. A device of the character described comprising a stationary tubular casing having an air port therein, a stationary gas port Within the said casing and atubular mixing chamber within the said casing movably disiaeaeao posed therein, the said mixing chamber beport Within the said casing and a tubular mixing chamber, having a vforward contracted injector portion, Within the said casing movably disposed therein, the said mixing chamber being provided'vvith auxiliary air and gas ports coperating respectively With thefirst mentioned air and gasl ports and adapted to simultaneously increase or decrease the effective openings of the said first mentioned air and gas ports according to the direction of the movement of the said movable mixing chamber With respect to the said stationary tubular casing.

4. A device of the character described comprising stationary means having air and gas admission orifices, and movable means' disposed Within the said stationar means having auxiliary air and gas ori ces, the said movable means being adapted by their movement to simultaneously control the eii'ective opening of the said stationary air and gas oriices in such a manner as to always preserve the same percentage of gas and air in the mixture.

5. A device of the character described comprising a tubular casing provided with al stationary ai:` port, a stationary gas port Within the said casing and a mixing chamber movable Within the said casingand adapted by its movement to simultaneously control the effective opening of the said stationary gas and air ports in such a manner as to always preserve the same percentage of gas and air in the mixture.

6. A device of the character described comprising a tubular casing provided with a stationary air port, a stationary gas port Within the said casing and a mixing chamber movable within the said casing provided with auxiliary air and gas ports and adapted by its movement to cause the said auxiliary ports to simultaneously control the effective opening of the said respective statlonary ports in such a manner as to always preserve the same percentage of gas and air in the combustible mixture.

7. lA device of the character described comprising a tubular casing having stationary air and gas ports and a mixing chamber movably disposed therein having auxiliary air and gas ports coperating With the rc- 'spective stationary ports, ythe said auxiliary ports being adapted to simultaneously con- York and State'of New York this 14th day trol the eective clpening' of the hsaid lsltationo April A. D. 1915. ary orts in suc a manner t at t e percentge composition of the air and gas in JOSEPH NEEDHAM 5 the mixture admitted into said mixing cham- Witnesses:

ber always remains constant. SADm R. RYAN,

Signed at New York in the county of New PAUL MCJUNKIN. 

